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(No Model.) 4 SheetsSheet 1I T. VOLSTORP.

ROTARY PULP STRAINER.

No. 483,030. Patented Sept. 20, 1892.

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4 Sheets Sheet 2.

(No Model.)

T.VOLSTORF. ROTARY PULP STRAINER.

,030. Patented Sept. 20; 1892.

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4 Sheets-Sheet 3. T. VOLSTORF.

ROTARY PULP STRAINER.

Patented Sept. 20, 1892.

4 SheetsSheet 4.

(No Model.)

T. VOLSTORF. ROTARY PULP STRAINER.

,030. Patented Sept. 20, 1892.

UNITED STATES PATENT OFFIcE.

THEODOR VOLSTORF, OF BERLIN, GERMANY.

ROTARY PU LP-STRAIN ER.

SPECIFICATION forming part of Letters Patent No. 483,030, datedSeptember 20, 1892.

Application filed October 11, 1889. Serial No. 326,710. (No model.)Patented in Germany September 4, 1889, No. 51,726; in England September14, 1889, No.14,494'; in France September 14, 1889, No. 200,768 inSwitzerland September 27, 1889, No. 1,446; in Belgium September 30.1889, No. 87,897, and in Austria-Hungary January 2, 1890, No. 40,360 andNo. 64,302-

To aZZ whom it may concern.-

Be it known that I, THEODOR VOLSTORF, of Berlin, in the Kingdom ofPrussia and German Empire, have invented certain new and usefulImprovements in Rotary Pulp-Strainers, (for which I have obtainedpatents in Germany, No. 51,726, dated September 4, 1889; inAustria-Hungary, No. 40,360 and No. 64,302, dated January 2, 1890; inEngland, No. 14,494, dated September 14, 1889; in France, No. 200,768,dated September 14, 1889; in Belgium,-No. 87,897, dated September 30,1889, and in Switzerland, No. 1,446, dated September 27, 1889,) of whichthe following specification, taken in connection with the accompanyingdrawings, which form a part thereof, is a full, clear, and exactdescription.

My invention relates to an apparatus for straining paper pulp andremoving lumps and knots therefrom in an effectual manner with a minimumwaste of water.

With this end in view my improved apparatus consists of an inclinedperforated straining-cylinder supported in suitable bearings in awashing tank or vessel, the construction and operation of which will behereinafter fully described.

In order that my invention may be fully understood, I will firstdescribe the same with reference to the accompanying drawings, and thenmore particularly point out in the claim the novel points.

In the drawings, Figure 1 is a longitudinal section of my improvedmachine. Fig. 2 is a side elevation of a detached portion of theperforated cylinder. Fig. 3 is a side elevation of the internal cylinderwith the Worm thereon. Fig. 4is an end view of the external perforatedcylinder. Fig. 5 is an upper end view of the two cylinders in position.Fig. 6 is a similar view to Fig. 1, showing the manner of supporting thestraining-cylinder in the tank. Fig. 7 is an end elevation of thedevice, showing the bearings of the straining apparatus. Figs. 8, 9, and10 are front, top, and side elevations, respectively, of thevertically-reciprocating bearings.

The cylinder at is formed of a suitable metal framework covered over itscircumference and lower end with perforated metal plates or gauze. It ismounted so as to rotate in the tank 00. on an inclined spindle b, whichis supported, as shown in Figs. 1 and 6, with both ends journaled insliding bearings 5, supported in the bifurcated ends 6 of the supports7.

The construction of the sliding bearings 5 is clearly shown in Figs. 6to 10, inclusive. Near the lower end of the spindle bis formed anannular flange b, which rests against the upper inclined face of thelower bearing 5. The bearings 5 have portions :0 00, which fit in thebifurcated ends 6 of the supports 7 and form guides for the verticalreciprocation of the strainer-cylinder.

b is a band-pulley on the end of spindle b for rotating it.

The means for imparting a vertical reciprocation will be hereinafterdescribed.

The lower end 0 of the cylinder is submerged, as shown in Figs. 1 and 6,while the upper open end of the cylinder is wholly above the level ofthe stock in the tank. Within the perforated cylinder a and mounted onthe same spindle Z7 is a smaller cylinder d, having a funnel-shapedmouth 6 at its upper end. This f nnnel-shaped mouth e terminates in thepipe or passage f,which is formed concentric with the cylinder Cl, andsurrounds the spindle b. The passage f conveys the material to the lowerinner end of the perforated cylinder CL, and for this purpose the sidesof the funnel e are inclined at such an angle that the material which isintroduced through the trough g flows naturally into the tubef. Thecylinder dis closed at its lower submerged end by an annular plate h, soas to form a compartment 11, which is hermetically sealed and filledwith air to act as a float and relieve the weight of the rotatingpulp-strainer. A spiral or worm is, of metal plate, is attached to theinner circumference of the cylinder at and fully occupies the spacebetween the cylinder and the inner drum. d, said drum at being formedslightly conical and forced into place. The pitch of the spiral isgradually decreases toward the upper end of the cylinder, as clearlyillustrated in Fig. 1. The pitch of the extreme upper end, however,increases, as shown at on, so as to form a right angle with the edge 0of the cylinder and retain some of the j et-water to float the knotsover the flange q. The paper stufi or pulp containing the knots isslowly raised by the worm k, the pulp leaving the cylinder through theperforations and the knots being discharged from the mou th of thecylinder into the knot-collecting box I. The cylinderd is furnished atits upper open end with an inner flange or rim s to prevent any overflowfrom the canal g, and the perforated cylinder at is provided with anouter flange q, the knots flowing back into the vessel '1 'r isasand-catcher tittedwith a plug r.v s and t are passages through whichthe strained pulp is carried away, and t is a partition slotted near itslower end for the passage and reciprocation of the shaft 1) and providedwith a flexible diaphragm t covering said slot and snugly surroundingthe shaft b.

Sprinkling-pipes to, Q), and w are arranged in connection with theapparatus,one of them a being arranged above the sieve-cylinder insteps, as clearly illustrated in Fig. 1. Each step is provided with aplug 11., whereby it can be readily cleaned. The pipe'v discharges itswater into the space between the upper ends of the two cylinders a and(Z, where the knots are led into the collector Z, while the pipe w playsupon the upper end of the cylinder a.

To facilitate the escape of pulp through the perforated cylinder a whileit is being raised by the worm is, a vertical reciprocation is impartedto the cylinder in addition to its rotation. This reciprocation isaccomplished by the following mechanism: 1 is a band-pulley upon a shaft2, which is journaled in suitable bearings supported above the strainingapparatus. On each end of the shaft 2 is a crank 23, connected to a linkor rod 4, which is attached to one of the sliding bearings 5. By thismeans it is obvious that the rotation of the pulley 1 will cause thestraining-cylinder to be reciprocated up and down,which will greatlyfacilitate the escape of the pulp, while the knots are carried upward bythe spiral k, which is slowly rotated with the cylinder a by the pulleyb. The higher the pulp is carried upward by the worm the more it isthinned by the water from the sprinklers u, v, and w, so that the knotsare cleared of the last particles of adhering pulp when they reach thetop of the cylinder and arepassed into the box l. The thinned pulp thenflows through the perforations in the cylinder ainto the tank 91. at adifferent level from the pulp which has already been cleaned. The pulpwhich has been thinned by the jet-water mixes with the thicker pulp inthe bottom of the vessel 'It and is carried away by the outlet-passage25.

By the employment of my improved apparatus the water which has been usedin the manufacture can be againutilized both for the manufacture and forfeeding the jet-pipes and is distributed in certain proportions. The

water to be used for the jets is passed through fine sieves, so as toavoid as far as possible the risk of clogging up the jet-pipes. Theapparatus keeps itself constantly clean, owing to the constant removalof the knots.

For the perfect cleansing of the apparatus the pulpstrainer is raised toa horizontal position by removing the bearings from the bifurcated endsof the supports 7 and supported above the tank. The end plates, whichare secured by screws or bolts, are then removed and the inner cylinderat withdrawn from the spiral at the upper end, or the platesconstituting the cylinder may be removed, and with them the attachedportions of the spiral.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters Patent, is-

1. In a paper-pulp strainer, the combination of the tank 72, thestraining-cylinder a, closed at its lower end and supported on anincline in said tank, the worm is within said cylinder, means forsupplying the pulp into said straining-cylinder, and means for impartinga rotary motion. to said cylinder and worm, as herein set forth.

2. In a paper-pulp strainer, the combination of the tank n, theinclinedcylinder a, and the worm It with a central conveyer-passage forleading the material to be treated to the bottom of the cylinder,asherein set forth.

3. In a paper-pulp strainer, the combination of the tank n, the inclinedcylinder a and the worm k with the central cylinder d andconveyer-passage f, as herein set forth.

4. In a paper-pulp'strainer, the combination of the tank 11. and theinclined cylinder ,a, supported on spindle b by suitable bearings, witha central air-chamber for relieving the weight of the bearings, asherein set forth.

5. In a paper-pulp strainer, the combination of the tank n, the inclinedcylinder a, supported on suitable bearings in the tank a, and a worm isinside of said cylinder with a central conveyer-passage f and a floatbetween said passage and the worm, as herein set forth.

6. The combination, with a rotary paperpulp strainer and a tank in whichthe strainer operates, of aconveyer spiral or worm k,

having its upper termination of suddenly-increased pitch, so as to meetthe mouth of the strainer at a right angle, as herein set forth. 7. Thecombination, with a rotary strainer and a tank in which the straineroperates, of a conveyer spiral or worm 7c of gradually-de-, creasingpitch from its lower to its upper end, as herein set forth.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

THEODOR VOLSTORF. Witnesses:

EMIL RIVNER, F. voN VERsEN.

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